A summer-flowering perennial with big clumps of bright yellow flowers in late summer lasting through to autumn. Supplied as 'bare roots', meaning it does not come in a pot or container but the roots are budding and ready to plant, ideally in the dormant season. Simply dig a hole, place the root in it with the bud peeping out, back-fill with soil then firm down and water well. You can buy one, two or three budding root-sections with this order.